-=> Quoting Reggie Arford to Gregory Procter <=-
 RA> This is "standard" nomenclature for curve radii (on US railroads,
 RA> at least). The angle quoted is the angle between the track and a
 RA> 100 foot long chord across the curve.
 RA> Reggie Arford
       In New Zealand the historical standard nomenclature for curve radii 
as
 "x chains" radius. I think the English used "feet" and France and Germany
 "metres" of actual radius. These are/were calculated from the versine and 
chord
 dimensions. Manuals of versine/radius dimensions were provided for track
 laying.
      Just to clarify your comments (I have been called pedantic before now 
:-)
 is the angle you quote above, the complete arc of the curve, or the angle of
 the track end to the chord. This makes a 2:1 difference to the result.
      The versine/chord measurement is easy for anyone with a string, tape
 measure and radius manual to check. Do you know how the angle was/is 
measured,
 the accuracy of measurement of the angle would have to be very precise, a
 minute or twos error would be a big change in radius.
      Thanks for the reply.
      Greg.P. (as in Procter, not Pedantic)
  
... ARRRRRGGGHHH!!!! ... Tension breaker, had to be done.
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